Its going to take a while. Every rep is diffrent so from my experience of keeping a lot of lizards I can’t say a couple of weeks to months because he has to know your scent but caimans can be kinda sketchy with attitude and aggressive like gators so be careful. I got many reptiles from others that was close to adulthood and they were mean it took me months to gain their trust. But overall congrats on your new caiman make sure you update on it I would like to see how they are in captivity. I’m too scared to get one lol the biggest reps I had were burmese pythons and monitors.